Wireless communication device

• US 7,684,468 B2
• Filed: 05/02/2006
• Issued: 03/23/2010
• Est. Priority Date: 05/13/2005
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Shimizu, Yuichiro, Sanada, Yukitoshi
• Primary Examiner(s): Ha; Dac V
• Application Number:
  US11/381,325
• Publication Number:
  US 20060256844A1
• Time in Patent Office: 1,421 Days
• Field of Search: 375/140, 375/143, 375/147, 375/152, 375/256, 375/340, 375/343, 375/354, 370/503, 370/515
• US Class Current: 375/147
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence

Abstract

A wireless communication device is provided. The wireless communication device executes digital processing for a received UWB signal with use of an A/D converter having an adequate sample rate and resolution, and thus can obtain precise reception timing information. Since the sample rate of an A/D converted output is high, a timing detection circuit is formed of two-stage matched filters. The former-stage chip matched filter calculates the correlation between an input signal and a template signal. When a correct transmission pulse signal has arrived, the chip matched filter outputs to a frame matched filter an indication as to the presence of a pulse and reception timing. The latter-stage frame matched filter calculates the correlation value between a received frame signal and a spreading code to thereby determine whether the received frame is correct or incorrect, and adequately changes a threshold value of the chip matched filter.

Claims

1. A wireless communication device that receives an Ultra Wide Band signal employing a pulse in a wideband, comprising:

an antenna part that receives an Ultra Wide Band signal;

a one-bit analog-to-digital converter that converts signal received by the antenna part into a digital signal;

N parallel counters that count the number of samples having a logical value of 1 in parallel for each of N samples, and output the counted number on a frame-by-frame basis, N denoting the number of samples in one frame time period; and

a timing detector that detects reception timing of a frame based on the number of samples having a logical value of 1 counted for each N samples.

2. The wireless communication device according to claim 1, wherein a conversion speed of the analog-to-digital converter is determined based on an employed communication method.

3. A wireless communication device that receives an Ultra Wide Band signal employing a pulse in a wideband, comprising:

an antenna part that receives a Ultra Wide Band signal;

an oversampling analog-to-digital converter that converts a signal received by the antenna part into a digital signal by executing oversampling;

a timing detector that detects reception timing based on the digital signal output from the analog-to-digital converter, and

wherein the oversampling analog-to-digital converter includes a one-bit analog-to-digital converter that converts a signal into a digital signal, and N parallel counters that count the number of samples having a logical value of 1 in parallel for each of N samples and output the counted number on a frame-by-frame basis.

4. A wireless communication device that receives an Ultra Wide Band signal employing a pulse in a wideband, comprising:

an antenna part that receives a Ultra Wide Band signal;

an oversampling analog-to-digital converter that converts a signal received by the antenna part into a digital signal by executing oversampling; and

a timing detector that detects reception timing based on the digital signal output from the analog-to-digital converter, and

wherein the timing detector includes two-stage matched filters including a chip matched filter and a frame matched filter wherein the chip matched filter calculates a correlation value between an input digital received signal and a certain template signal, and if the correlation value is larger than a threshold value, the chip matched filter recognizes that a correct transmission pulse signal has arrived, and outputs to the frame matched filter an indication as to presence of a pulse and a result of detection of reception timing.

5. The wireless communication device according to claim 4, wherein the frame matched filter calculates a correlation value between a received frame signal and a spreading code to thereby determine whether a received frame is correct or incorrect, and the frame matched filter finally outputs reception timing if a determination is made that the received frame is correct, and the frame matched filter instructs the chip matched filter to change the threshold value if a determination is made that the received frame is incorrect.